Energy saving control circuit for LED lamp

Abstract

The invention discloses an LED lamps energy conservation control circuit capable of timingly changing brightness; the circuit has simple structure, high efficiency, low power consumption, and capability of saving energy and prolonging service life of a lamp. The invention comprises a rectification filter circuit (1), a voltage regulator circuit (2), LED load (3), a constant current source device (4), and a timing circuit (8); through rectification and filtration by the rectification filter circuit (1), alternating current is changed into direct current and is then regulated through the voltage regulator circuit (2) to be constant direct current output, thus an output end (A) and an earth terminal (G) are formed; after connected in series, the LED load (3) and the constant current source device (4) are connected between the output end (A) and the earth terminal (G) to form a return circuit; the timing circuit (8) is connected with the voltage regulator circuit (2) for providing timing feedback signal to change output voltage of the voltage regulator circuit (2). The LED lamps energy conservation control circuit capable of timingly changing brightness can be widely applied to the LED lamp field.

Description

technical field [0001] The invention relates to a circuit for an LED lamp, in particular to an energy-saving control circuit for an LED lamp. Background technique [0002] At present, LEDs are more and more widely used, and LED lamps for daily outdoor and indoor lighting are also becoming more and more popular. The output voltage of the existing LED lamp is generally fixed, so the brightness of the lamp is always kept constant when it is working. In some occasions, lamps do not need to maintain the highest brightness all the time, such as street lights, garden lights and corridor lights. When there are many people in the first half of the night, it is necessary to have high brightness to provide good lighting effects, but in the second half of the night when there are fewer people. , only a darker light effect is needed to achieve the effect of indicating lighting, and it is a waste to keep the brightness constant at this time. [0003] In the circuit of LED lamps, althoug...

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Problems solved by technology

When a negative voltage is applied between the gate and the source, the channel can be cut off, and the conduction current is zero. The gate voltage at this time is defined as the turn-on voltage, but if the channel concentration is too thick and the depth is too deep, the gate Pole will not be able to intercept the channel current

The depletion-type MOS transistor is not as convenient as the enhancement-type MOS transistor in logic application because the drain-source current is turned on at a constant current when the gate and source voltages are zero, so it has not been isolated by the industry. Make a device to use

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